A Story In A Diary [COMPLETE]

Woozi had left to Busan, his hometown where he was born and raised.
The others had asked him why he must left on the day he told them. He just answered with a simple 'emergency call from Busan and 'I'll tell you guys more details after I came back'.
But what everyone didn't expect is that The Busan Boy had left his Diary underneath his pillow, so someone who came in and find out have to read it first.